Could Keystone XL realistically be revived?

When Donald Trump and Mark Carney met in the White House for the first time a few months ago, the meeting looked, and was, tense. Not so this latest time. Smiles, laughs and lots of almost boyish banter. What was that all about?  Has anything really changed? Could a deal be in the offing, or was it all for the cameras? Bruce and Chantal have their say.

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